\usepackage{a4}
\usepackage[latin2]{inputenc}
\usepackage{t1enc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathptmx}
\usepackage{array}
\usepackage[english]{babel}
\usepackage{color}
\usepackage{tabularx}
\usepackage{makeidx}
\usepackage{xfrac} % nicely formated fractions
\usepackage[useregional]{datetime2}
\definecolor{lightmagenta}{cmyk}{0,0.333,0,0}
\usepackage[pdfpagemode={UseOutlines}, pdfstartview={Fit},
        bookmarks,bookmarksnumbered,bookmarksopen,bookmarksopenlevel=0,
        plainpages=false, pdfpagelabels,
        backref=page, breaklinks=true, colorlinks=true,
        filecolor={lightmagenta},urlcolor={magenta},
        linkcolor={blue},citecolor={blue}]{hyperref}
\usepackage[version=3]{mhchem} % chemical typesetting
